Description Features: brand new and high quality Volume B50K; Pickup MN250K. Bass: +/- 10dB 30Hz B50K; Treble: +/- 10dB at 6KHz B50K. P1 should be wired with neck pickup positive; P2 should be wired with bridge pickup positive; Should be wired with two pickups negative. High quality preamp, not inferior circuit made of cheap factories. Please consult your local luthiers if you donfor t know how to install the circuit. Specifications: Material: MetalPlastic Color: As The Picture Shows Package Weight: approx.80g Size: approx.4.0x3.07x1.1cm/1.57x1.21x0.43in (More Size Details, Please See Photo.) Note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 2Pcs x Bass Pickups 1Pc x Wired Bass Control Plate